From 62b30f09acae20f83dfb7995fa8b221c35e2fbff Mon Sep 17 00:00:00 2001
From: "Wladimir J. van der Laan" <laanwj@gmail.com>
Date: Wed, 14 Jan 2015 11:07:13 +0100
Subject: [PATCH] Add serialize float/double tests

---
 src/test/serialize_tests.cpp | 96 ++++++++++++++++++++++++++++++++++--
 1 file changed, 93 insertions(+), 3 deletions(-)

diff --git a/src/test/serialize_tests.cpp b/src/test/serialize_tests.cpp
index e2d19ce5cc..de9510d54a 100644
--- a/src/test/serialize_tests.cpp
+++ b/src/test/serialize_tests.cpp
@@ -4,6 +4,7 @@
 
 #include "serialize.h"
 #include "streams.h"
+#include "hash.h"
 
 #include <stdint.h>
 
@@ -26,15 +27,104 @@ BOOST_AUTO_TEST_CASE(sizes)
     BOOST_CHECK_EQUAL(sizeof(uint64_t), GetSerializeSize(uint64_t(0), 0));
     BOOST_CHECK_EQUAL(sizeof(float), GetSerializeSize(float(0), 0));
     BOOST_CHECK_EQUAL(sizeof(double), GetSerializeSize(double(0), 0));
-
     // Bool is serialized as char
     BOOST_CHECK_EQUAL(sizeof(char), GetSerializeSize(bool(0), 0));
+
+    // Sanity-check GetSerializeSize and c++ type matching
+    BOOST_CHECK_EQUAL(GetSerializeSize(char(0), 0), 1);
+    BOOST_CHECK_EQUAL(GetSerializeSize(int8_t(0), 0), 1);
+    BOOST_CHECK_EQUAL(GetSerializeSize(uint8_t(0), 0), 1);
+    BOOST_CHECK_EQUAL(GetSerializeSize(int16_t(0), 0), 2);
+    BOOST_CHECK_EQUAL(GetSerializeSize(uint16_t(0), 0), 2);
+    BOOST_CHECK_EQUAL(GetSerializeSize(int32_t(0), 0), 4);
+    BOOST_CHECK_EQUAL(GetSerializeSize(uint32_t(0), 0), 4);
+    BOOST_CHECK_EQUAL(GetSerializeSize(int64_t(0), 0), 8);
+    BOOST_CHECK_EQUAL(GetSerializeSize(uint64_t(0), 0), 8);
+    BOOST_CHECK_EQUAL(GetSerializeSize(float(0), 0), 4);
+    BOOST_CHECK_EQUAL(GetSerializeSize(double(0), 0), 8);
+    BOOST_CHECK_EQUAL(GetSerializeSize(bool(0), 0), 1);
 }
 
+BOOST_AUTO_TEST_CASE(floats_conversion)
+{
+    // Choose values that map unambigiously to binary floating point to avoid
+    // rounding issues at the compiler side.
+    BOOST_CHECK_EQUAL(ser_uint32_to_float(0x00000000), 0.0F);
+    BOOST_CHECK_EQUAL(ser_uint32_to_float(0x3f000000), 0.5F);
+    BOOST_CHECK_EQUAL(ser_uint32_to_float(0x3f800000), 1.0F);
+    BOOST_CHECK_EQUAL(ser_uint32_to_float(0x40000000), 2.0F);
+    BOOST_CHECK_EQUAL(ser_uint32_to_float(0x40800000), 4.0F);
+    BOOST_CHECK_EQUAL(ser_uint32_to_float(0x44444444), 785.066650390625F);
+
+    BOOST_CHECK_EQUAL(ser_float_to_uint32(0.0F), 0x00000000);
+    BOOST_CHECK_EQUAL(ser_float_to_uint32(0.5F), 0x3f000000);
+    BOOST_CHECK_EQUAL(ser_float_to_uint32(1.0F), 0x3f800000);
+    BOOST_CHECK_EQUAL(ser_float_to_uint32(2.0F), 0x40000000);
+    BOOST_CHECK_EQUAL(ser_float_to_uint32(4.0F), 0x40800000);
+    BOOST_CHECK_EQUAL(ser_float_to_uint32(785.066650390625F), 0x44444444);
+}
+
+BOOST_AUTO_TEST_CASE(doubles_conversion)
+{
+    // Choose values that map unambigiously to binary floating point to avoid
+    // rounding issues at the compiler side.
+    BOOST_CHECK_EQUAL(ser_uint64_to_double(0x0000000000000000ULL), 0.0);
+    BOOST_CHECK_EQUAL(ser_uint64_to_double(0x3fe0000000000000ULL), 0.5);
+    BOOST_CHECK_EQUAL(ser_uint64_to_double(0x3ff0000000000000ULL), 1.0);
+    BOOST_CHECK_EQUAL(ser_uint64_to_double(0x4000000000000000ULL), 2.0);
+    BOOST_CHECK_EQUAL(ser_uint64_to_double(0x4010000000000000ULL), 4.0);
+    BOOST_CHECK_EQUAL(ser_uint64_to_double(0x4088888880000000ULL), 785.066650390625);
+
+    BOOST_CHECK_EQUAL(ser_double_to_uint64(0.0), 0x0000000000000000ULL);
+    BOOST_CHECK_EQUAL(ser_double_to_uint64(0.5), 0x3fe0000000000000ULL);
+    BOOST_CHECK_EQUAL(ser_double_to_uint64(1.0), 0x3ff0000000000000ULL);
+    BOOST_CHECK_EQUAL(ser_double_to_uint64(2.0), 0x4000000000000000ULL);
+    BOOST_CHECK_EQUAL(ser_double_to_uint64(4.0), 0x4010000000000000ULL);
+    BOOST_CHECK_EQUAL(ser_double_to_uint64(785.066650390625), 0x4088888880000000ULL);
+}
+/*
+Python code to generate the below hashes:
+
+    def reversed_hex(x):
+        return binascii.hexlify(''.join(reversed(x)))
+    def dsha256(x):
+        return hashlib.sha256(hashlib.sha256(x).digest()).digest()
+
+    reversed_hex(dsha256(''.join(struct.pack('<f', x) for x in range(0,1000)))) == '8e8b4cf3e4df8b332057e3e23af42ebc663b61e0495d5e7e32d85099d7f3fe0c'
+    reversed_hex(dsha256(''.join(struct.pack('<d', x) for x in range(0,1000)))) == '43d0c82591953c4eafe114590d392676a01585d25b25d433557f0d7878b23f96'
+*/
 BOOST_AUTO_TEST_CASE(floats)
 {
-    // TODO ser_uint32_to_float, ser_uint64_to_double
-    // TODO ser_float_to_uint32, ser_double_to_uint64
+    CDataStream ss(SER_DISK, 0);
+    // encode
+    for (int i = 0; i < 1000; i++) {
+        ss << float(i);
+    }
+    BOOST_CHECK(Hash(ss.begin(), ss.end()) == uint256S("8e8b4cf3e4df8b332057e3e23af42ebc663b61e0495d5e7e32d85099d7f3fe0c"));
+
+    // decode
+    for (int i = 0; i < 1000; i++) {
+        float j;
+        ss >> j;
+        BOOST_CHECK_MESSAGE(i == j, "decoded:" << j << " expected:" << i);
+    }
+}
+
+BOOST_AUTO_TEST_CASE(doubles)
+{
+    CDataStream ss(SER_DISK, 0);
+    // encode
+    for (int i = 0; i < 1000; i++) {
+        ss << double(i);
+    }
+    BOOST_CHECK(Hash(ss.begin(), ss.end()) == uint256S("43d0c82591953c4eafe114590d392676a01585d25b25d433557f0d7878b23f96"));
+
+    // decode
+    for (int i = 0; i < 1000; i++) {
+        double j;
+        ss >> j;
+        BOOST_CHECK_MESSAGE(i == j, "decoded:" << j << " expected:" << i);
+    }
 }
 
 BOOST_AUTO_TEST_CASE(varints)